The Sarcodina 225 



tion, fusion of several plasmodia into a single large one measuring as 

 much as I500[jl has been described in J'ampyrella closterii (112). Plas- 

 motomy within the cyst has been reported in Arachnula (33) and Vajn- 

 pyrella (112). The details of encystment may vary slightly. In a strain of 

 Leptomyxa reticulata recovered from hops (88), the cysts (Fig. 5. 17, G) 

 were large (425-900[j.) and contained only one endocyst. In other strains 

 (43, 138) several multinucleate endocysts have been found within an 

 ectocyst (Fig. 5. 17, B). 



Leptomyxa reticulata occurs in the soil (138) and as a secondary in- 

 vader of diseased hops (88). Arachmila itnpatie7is has been described from 

 fresh and brackish water (33), while species of Vampyrella attack Spiro- 

 gyra (85) and Closteriinn (112) by digesting a portion of the cell wall 

 and sucking out the contents. 



Both large plasmodial forms (Fig. 5. 17, I) and smaller uninucleate 

 organisms (52; Fig. 5. 17, H) have been assigned to Biomyxa Leidy but 





Fig. 5. 18. A-G. Hyalodiscus rubicundus Hertwig and Lesser: oval forms 

 (35-70 X 20-50yn) seen from above (A) and from the side (B); invading cells 

 of Oedogoniutn (C, D); resting form with radiating pseudopodia (E); speci- 

 mens in locomotion, seen from above (F) and from the side (G); A-D, after 

 Hoogenraad; E-G, after Penard. H-K. Vampyrellidium vagana Zopf: various 

 amoeboid forms (H-J); resting cyst (K); schematic (after Ivanic). 



